package com.example.weight.util;

import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.content.Context;
import android.media.MediaMetadataRetriever;
import android.os.Environment;
import java.io.File;
import java.io.FileOutputStream;
import android.net.Uri;
import android.content.Intent;
import java.io.IOException;
import java.util.HashMap;

public class ImageUtil {

    //根据传入的宽和高，计算出合适的inSampleSize值
    public static int calculateInSampleSize(BitmapFactory.Options options,
                                            int reqWidth, int reqHeight) {
        // 源图片的高度和宽度
        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;
        if (height > reqHeight || width > reqWidth) {
            // 计算出实际宽高和目标宽高的比率
            final int heightRatio = Math.round((float) height / (float) reqHeight);
            final int widthRatio = Math.round((float) width / (float) reqWidth);
            // 选择宽和高中最小的比率作为inSampleSize的值，这样可以保证最终图片的宽和高
            // 一定都会大于等于目标的宽和高。
            inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
        }
        return inSampleSize;
    }

    //根据所需要的宽高获取相应的图片
    public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId,
                                                         int reqWidth, int reqHeight) {
        // 第一次解析将inJustDecodeBounds设置为true，来获取图片大小
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeResource(res, resId, options);
        // 调用上面定义的方法计算inSampleSize值
        options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
        // 使用获取到的inSampleSize值再次解析图片
        options.inJustDecodeBounds = false;
        return BitmapFactory.decodeResource(res, resId, options);
    }

    //保存文件到指定路径
    public static boolean saveImageToGallery(Context context, Bitmap bmp) {
        // 首先保存图片
        String storePath = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "dearxy";
        File appDir = new File(storePath);
        if (!appDir.exists()) {
            appDir.mkdir();
        }
        String fileName = System.currentTimeMillis() + ".jpg";
        File file = new File(appDir, fileName);
        try {
            FileOutputStream fos = new FileOutputStream(file);
            //通过io流的方式来压缩保存图片
            boolean isSuccess = bmp.compress(Bitmap.CompressFormat.JPEG, 60, fos);
            fos.flush();
            fos.close();

            //把文件插入到系统图库
            //MediaStore.Images.Media.insertImage(context.getContentResolver(), file.getAbsolutePath(), fileName, null);

            //保存图片后发送广播通知更新数据库
            Uri uri = Uri.fromFile(file);
            context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, uri));
            if (isSuccess) {
                return true;
            } else {
                return false;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return false;
    }

    /**
     * 获取网络图片第一帧  异步调用，不然会引起卡顿
     * @param videoUrl
     * @return
     */

    public Bitmap getNetVideoBitmap(String videoUrl) {
        Bitmap bitmap = null;
        MediaMetadataRetriever retriever = new MediaMetadataRetriever();
        try {
            //根据url获取缩略图
            retriever.setDataSource(videoUrl, new HashMap());
            //获得第一帧图片
            bitmap = retriever.getFrameAtTime();
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } finally {
            retriever.release();
        }
        return bitmap;
    }

}
